MODEL TFM-138 SERIES -
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Technisonic VHF FM Airborne Transceivers TFV-lJaB Technisonic TFM-138 series airborne VHF/FM transceivers utilize state of the art frequency synthesis techniques to provide FM communications on every currently available channel within the vHf/Fm High Band. These radios cover the entire band from 138 to 174 MHz in 2.5 KHz increments. Data entry and function control are via a front panel 12 button keypad. Operating frequency and other related data are presented on a 48 character two line LED matrix display which is available in either green or red. Technisonic FM transceivers can be operated in the Direct Entry or Simplex mode by simply keying in the desired operating frequency, or can function without restriction on any split frequency pair within the band. The TFM-138 features 100 preset memory positions each of which is capable of storing a receive frequency, a transmit frequency, a separate CTCSS tone for each receive and transmit frequency and an alpha numeric identifier for each channel. The TFM-138B features similar storage capability, but provide for 120 channels of preset memory, and offer the additional capability of allowing for DPL (Digital Private Line) or DCS (Digitally Coded Squelch) operation. The TFM-138 and TFM-138B allows either 25 kHz wide band or 12.5 kHz narrow band operation on any or all their preset memory channels. Data can be easily entered into any of the preset non-volatile memory positions for both main and guard channels via the front panel keyboard. Information stored in memory is available for instant recall by keypad entry, or by pressing the UP or DOWN button which allows the operator to scroll through all preset channels. Technisonic FM transceivers feature a synthesized two channel guard, receiver, a DTMF encoder for signaling during transmit, and a scan function which will scan any or all of the frequencies stored in the preset memory positions. TFM-138 series transceivers are panel mounted (Dzus mounting) and are completely self contained in a 8.0 x 3.0 x 5.75 inch chassis weighing just 3.1 pounds. Front panel controls are MAIN for main channel volume; GUARD for guard channel volume; MON for squelch test; a MN/GD switch provides for main or guard transmitter selection; a G1/G2 switch selects guard 1 or guard 2 receive and transmit; and a HI/LO switch allows for control of transmitter power output. Hi power is 10 Watts output, low power is 1 Watt output, which is necessary to comply with Marine harbor environment rules. These transceivers offer 28 volt DC backlighting, which is controlled by the aircraft dimmer bus. Display brightness is controlled from the front panel keypad. The small size and light weight of TFM-138 series transceivers make them ideally suited to helicopter installations Technisonic FM transceivers are compliant with RTCA DO-160C categories relating to Vibration, Overpressure, Humidity, Temperature and Altitude, Magnetic Effect, Power Input, Voltage Spike, Decompression, and RF emission (including Section 21, Category Z)